Non-invasive operations, which do not disturb existing materials, include
setup, field reconnaissance, biological surveying, geophysical and topographical
surveying, and decontamination, removal of trees and brush, and miscellaneous
Support Zone activities. If during the initial evaluation the Incident
Safety Officer deems it necessary, one member of the field team will monitor
the ambient breathing zone air continuously with a PID, which detects total
hydrocarbons present in the air. The PID will be calibrated each day prior
to fieldwork. A spectrophotometer or gas chromatograph should be used for
more precise readings. A radiation survey meter will be used to monitor
ionizing radiation at selected areas where radioactive contaminants may
have been disposed.